Checking the basics: Biology Topic 1

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Describe the sturctue of a water molecule.
It is a dipolar molecule (oxygen is partially +ve and the hyrdogens are partially -ve) Bonds by hydrogen bonding.
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Sequence of events in the cardiac cycle.
Diastole (all vavles shut/ all relaxed) Atrial systole (Atria contract/ A-V open/ S-L shut) Ventricular systole (Ventircles contract/ A-V shut/ S-L open)
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What leads to atherosclerosis?
Artery wall damaged-White blood cells enter damaged site-Cholesterol build up-Atheroma forms-Calcium salts and fibrous tissue build up causing scaring and loss of elsticity in artey walls
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Sequence of events leading to blood clots.
Thromboplastin catalyses reaction of Prothrombin to thrombin, which catalyses reaction of fibrinogen into fibrin which causes RBC and platelets to accumulate (blood clot)
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What can increase the risk of CVD?
Increasing age/Being male/A genetic predispostion/Smoking/High blood pressure/Inactivity or sedentary life
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What aspects of diet can increase risk of CVD?
High salt/High LDL cholesterol/High saturated fats
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What polysaccharides make up starch?
Amylose and Amylopectin
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Why are polysaccharides considered good energy store molecules?
Insoluble in water/Compact/have side chains/ Have 1,4-1,6 glycosidic bonds
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Describe a basic stucture of a triglyceride.
A single glycerol molecule bonded with an ester bond to 3 sepreate fatty acid chains
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How are triglycerides formed/broken?
Formed by condensation reaction (forms an ester bond and a water molecule)/ Broken by a hydrolysis reaction (uses a water molecule)
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What are mono-unsaturated/poly-unsaturated/saturated lipids?
Mono-unsaturated: Single C=C double bond-Poly-unsaturated: More than one C=C double bond-Saturated: No C=C double bond
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Other cards in this set

Card 2

Front

Sequence of events in the cardiac cycle.

Back

Diastole (all vavles shut/ all relaxed) Atrial systole (Atria contract/ A-V open/ S-L shut) Ventricular systole (Ventircles contract/ A-V shut/ S-L open)

Card 3

Front

What leads to atherosclerosis?

Back

Preview of the front of card 3

Card 4

Front

Sequence of events leading to blood clots.

Back

Preview of the front of card 4

Card 5

Front

What can increase the risk of CVD?

Back

Preview of the front of card 5
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